一元一次中考经典题含答案

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4、 ”the - 18,teun-erngy - 1 B. m- 3 C. m 3D. m 34. （2014?玄武区二模）方程 2x 4=8的解是（）A . x= - 2B . x=2C. x=4D . x=65. （2014?金华模拟）已知关于 x的方程2x-m-5=0的解是x=- 2,则m的值为（）A. 9B. -9C. 1D. - 1y为1时，输入数值x为（）6. （2014?相城区一模）根据流程右边图中的程序，当输出数值A. - 8B. 8C. - 8或 8D.不存在7. （2014?大庆）某市出租车起步价是5元（3公里及3公里以内为起步价），以后每公里收费是 1.6元，不足1公里按1

5、公里收费，小明乘出租车到达目的地时计价器显示为11.4元，则此出租车行驶的路程可能为（）A. 5.5公里 B. 6.9公里C. 7.5公里 D. 8.1公里8. （2014?博白县模拟）已知关于 x的方程2x - m+5=0的解是x= - 2,则m的值为（）A. 1B. -1C.9D. -99. （2014?高邮市模拟）若关于 x的方程2x-a=x-2的解为x=3 ,则字母a的值为（）A. -5B. 5C.-7D. 710. （2014?绍兴）如图1,天平呈平衡状态，其中左侧秤盘中有一袋玻璃球，右侧秤盘中也有一袋玻璃球，还有2个各20克的祛码.现将左侧袋中一颗玻璃球移至右侧秤盘，并拿走右侧秤盘

6、的1个祛码后，天平仍呈平衡状态，如图2,则被移动的玻璃球的质量为（）lot be seaatd frm Ie woe ara 646 grssroos pay orgaizt ons ad 14,146 m besof broad paric pain a ndlupport.Through t he w su. and eucain, sot ha eey cl of Ie pay he at, evey organiat on s st ong s tha al membes of Ieahbeleve,skdoes not acualy fx probl ems, ouSpoken, a

7、 nd jump on Ie a ssessmet of the partys pokes, and so on. B I iu Secetaypoite . out tha a quale of Ie ecnomic stuaton s very sei ous, thee s resue on evbnment, seasonal facts and other i be c reasons, but mai i y subje. - eprobem, s the problem of party members nd cadres. Some pressed, negatve sa ck

8、 not re sponsile . Dube six one, and w o took the lead, buid enegybust, Hong san. i c, ecnomc prosper), eclvabe, cvize . ad hamonius isand. It -rta ny 一24. （2013?泉州）方程 x+1=0的解是 .25. （2014?通州区一模）列方程或方程组解应用题：现有甲、乙两个空调安装队分别为A、B两个公司安装空调，甲安装队为A公司安装66台空调，乙安装队为 B公司安装60台空调，两个安装队同时开工恰好同时安装完成，甲队比乙队平均每天多安装2台空调

9、.求甲、乙两个安装队平均每天各安装多少台空调.26. （2014?黄冈四月调考）为了改善住房条件，小亮的父母考察了某小区的A、B两套楼房，A套楼房在第3层楼,B套楼房在第5层楼，B套楼房的面积比 A套楼房的面积大24平方米，两套楼房的房价相同，第 3层楼和第5层 楼的房价分别是平均价的 1.1倍和0.9倍，求两户型楼房的面积.27. （2014?南昌县模拟）如图，已知箭头的方向是水流的方向，一艘游艇从江心岛的右侧A点逆流航行3小时到达B点后，又继续顺流航行 2小时15分钟到达C点，总共行驶了 198km,已知游艇的速度是 38km/h .（1）求水流的速度；（2）由于AC段在建桥，游艇用同样的

10、速度沿原路返回共需要多少时间？28. （2013?柳州）解方程：3 （x+4） =x.29. （2014?晋江市二模）学校举办一年一届的科技文化艺术节活动，需制作一块活动展板，请来两名工人.已知师傅单独完成需4天，徒弟单独完成需 6天.（1）两个人合作需要 天完成；（2）现由徒弟先做1天，再两个合作，问：还需几天可以完成这项工作？30. （2013?梧州）解方程：-x+2 （小+1）=8+k.I sum u, is dvddd ito 9 maipat s I wt rgad to pe ig a nd develpig scilimwihCCine-caacer - s s I ce Ie

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16、d China .e- y beei peope and beei wrd pe ope i nnovain_e its Shi, dram sutaeh is poteta aceahbeleve,skdoes not acualy fx probl ems, ouSpoken, a nd jump on Ie a ssessmet of the partys pokes, and so on. B I iu Secetaypoite . out tha a quale of Ie ecnomic stuaton s very sei ous, thee s resue on evbnmen

17、t, seasonal facts and other i be c reasons, but mai i y subje. - eprobem, s the problem of party members nd cadres. Some pressed, negatve sa ck not re sponsile . Dube six one, and w o took the lead, buid enegybust, Hong san. i c, ecnomc prosper）, eclvabe, cvize . ad hamonius isand. It -rta ny 一己是一7-

18、次 | 方程，故本选项 ，昔误；D、不兀次方程，故本选,错误；故选B.点评：卜题考查J 一 卜-次方程的 定义的应用，注 意：只含有一个 未知数，并且所 ,未知数的最 高次数是1的整 式方程，叫一元 卜灯程.|3. （2014?太仓市二模）若关于 x的方程4x- m+2=3x - l的解为正数，则 m的取值范围是（）A. m 1 B. m 3C. m 3D. m0,解得：m3.故选C.点评：;，题是一个方 “与不等式的 综合题目.解关于x的不等式是 ，题的一个难 占八4. （2014?玄武区二模）方程 2x-4=8的解是（D. x=6A . x= - 2B . x=2C. x=4考点：解一元一

19、次方I卜. I专题：计算题.分析：方程移项合并，将x系数化为1,即可求出解.解答：解：方程移项合并得：2x=12,解得：x=6, 故选D.点评：此题考查了解一元一次方程， 其步骤为：去分母，去括号，移项合并，将x系数化为1,即可 求出解.5. （2014?金华模拟）已知关于 x的方程2x-m-5=0的解是x=- 2,则m的值为（）A. 9B. - 9C. 1D. - 1考点：一元一次方程的解.分析：把x= - 2代入方程，即可得到一个关于m的方程，解方程求得m的值.解答：解：把x= 2代入方程，得：-4 - m - 5=0 , 解得：m= - 9.故选B.点评：本题考查了一元一次方程的 解的定

20、义：使一 元一次方程左 右两边相等的 未知数的值叫 做一元一次方 程的解，比较简 单.6. （2014?相城区一模）根据流程右边图中的程序，当输出数值 y为1时，输入数值乂为（）s-u,i - part s witega. -cl- wil ccinese caa the General irgi na. - e wih ,esecaa -w Chin - caa -yse!”，sysem, uhd and l- ” - ca - eris- i epounded, ui- st leade - Cie - c xi General Se ceays seec i tlis egr. ic -

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24、 on s st ong s tha al membes of Ieahbeleve,skdoes not acualy fx probl ems, ouSpoken, a nd jump on Ie a ssessmet of the partys pokes, and so on. B I iu Secetaypoite . out tha a quale of Ie ecnomic stuaton s very sei ous, thee s resue on evbnment, seasonal facts and other i be c reasons, but mai i y s

25、ubje. - eprobem, s the problem of party members nd cadres. Some pressed, negatve sa ck not re sponsile . Dube six one, and w o took the lead, buid enegybust, Hong san. i c, ecnomc prosper), eclvabe, cvize . ad hamonius isand. It -rta ny 一I sum u, is dvddd ito 9 maipat s I wt rgad to pe ig a nd devel

26、pig scilimwihCCine-caacer - s s I ce Ie XOn more Ia n one ocasin, Geea Slcetay of Ietri l oi n ad deve opme nt prcss of soc - m w CCe caace s the rad of socil-w Ci nee caa cteisis, SystmIfo, systm, uphold and d lpte undesadig of soca-m wtCCiele charcteisis i s deemie d I hav e bbe,prfudy - pou d, ur

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